Automatic controlling mechanism for oil burners



1,614 918 1927' w. DREYFUS AUTOMATIC CONTROLLING MECHANISM FOR OILBURNERS Filed Dec. 8, 1924 5 Sheets-Sheet l 27 INVENTOR.

. l I w; /6 AT ORNEYS.

w. L. DREYFUS AUTOMATIC CONTROLLING MECHANISM FOR OIL BURNERS Jan.

Filed Dec. 8, 1924 5 Sheets-Sheet 2 INVEN TOR. 051m .1

A TT RNEYS.

1,614,918 Jan. 18, 1927. L DREYFUS AUTOMATIC CONTROLLING MECHANISM FOROIL BURNERS Filed Dec. 8, 1924 5 Sheets-Sheet 5 5 INVENTOR. Mafia [084%.

BY 8 I la/ l 17- AT ORNEYS.

Jan. 1 1927.

w. 1.. DREYFUS AUTOMATIC CONTROLLING MECHANISM FOR OIL BURNERS FiledDec. 8. 1924 5 Sheets-Sheet 4 [null WW1, W

J u w INVEN TOR.

A TTNEYS.

Jan. 18, 1927. 1,614,918

W. L. DREYFUS AUTOMATIC CONTROLLING MECHANISM FOR OIL BURNERS IN V ENTOR.

ATTO EYS.

Patented Jan. 18, 1927.

WALTER L. DBEYFUS, 01!! SAN FBANCISCQ, CALIFORNIA.

K Acronyms CONTROLLING nncnmxsu non OIL- nunnnas.

Application filed December 8, 191 24. Serial no. 754.5153.

This invention relates to an automatic con lication is that in which anatomizing cup 18 employed, which is either directly or indirectlyrotated by means of an electric motor. A burner of this character mustbe provided with means for delivering oil to the atomizing cup, togetherwith means for turning the oil oil or on; it must be provided with meansfor opening or closing the motor circuit, and with means for ignitingthe oil and, in some instances, with means for preheating the atomizingcup when starting the burner. This involves the use ofa number ofelectric switches and valves, together with means for automaticallyopening and closing the same, and while a number of automatic actuatingmechanisms, such as previously referred to, are in more or less commonuse, satisfactory results are not obtained as they are too complicatedand involved, or too delicate for dependable and continuous operation.

The object of the present invention is to provide an automatic actuatedmechanism which is entirely mechanical in operation and rigid inconstruction; to provide a mechanism of this character which eliminatesthermostats, solenoids and like delicate devices, and further, toprovide a mechanical actuating mechanism which is adapted to be drivenby the electric motor of the burner.

One form which my invention may assume is exemplified in the followingdescription and illustrated in the accompanying drawings. in which--Fig. 1 is a plan view of the burner actuating mechanism showing it instarting position.

Fig. 2 is a plan view with part of the mechanism removed for the purposeof illustrating the governor actuating portion of the mechanism.

Fig. 3 is a plan view similar to Fig. 1, but

" showing the mechanism in operation, said view showing the gas valve inopen position I and the electric ignition circuit. closed.

Fig. 4 is a view similar to Fig. 2 showing the governor in operatingposition.

Fig. 5 is a plan view similar to Fig. 1 showing the'gas and oil valve inopen position, the air damper in open position, and the ignition circuitbroken.

Fig. 6 is a detail plan view showing the osition assumed by theactuating mechanism when the burner is in operation.

Fig. 7 is a side elevation in section, taken on line 7-7 of Fig. 1.

Fig. 8 is a detail side elevation in section, taken on line 88 of Fig.1.

Fig. 9 is a cross-section taken on line 99 of Fig. 1.

Fig. 10 is a plan view of a furnace showing an oil burner installedtherein and the actuating mechanism connected therewith.

Referring to Fig. 10 of the drawings, it will be seen that the burnerillustrated employs an atomizing cup A to which oil is delivered througha ipe 2, said cup serving the function of atomizingthe oil by heat andcentrifugal action and projecting the oil into the furnace chamber B,where combustion takes place. The atomizing cup is mounted on avertically disposed shaft 3 and is rotated at a fairly high rate ofspeed b means of an impeller or turbine secured on t e shaft at a pointbelow the atomizing cup A, the A turbine being in turn driven by a blastof air discharged from a blower C which is driven by an electric motorD.

To start a burner of this character it is first necessary to heat theatomizin suitable means, as in this instance by a gas flame. Toaccomplish this preheating, a gas burner is placed below the atomizingcup and the cup is subjected to the heat of the flame and is thuspreheated. It is necessary to provide a valve which will regulate theflow of gas to said burner; it is necessary to employ a pilot light orother means for igniting the burner; it is necessary to open an airdamper E so that air in suflicient quantities will be delivered to startrotation of the atomizing cup after it has been preheated; it isnecessary to turn on the oil after the cup has been preheated and hasstarted rotating, and it 1s finall necessary to turn off the gas afterthe pre eating has been accomplished and the oil ignited. All of theseoperations consist in the opening cup by and closing of electricswitches, valves, air v is is automatically dampers, etc., and th takencare of by the actuating mechanism nerallyindicated at F. This mechanism18 best illustrated in Figs. 1, 2, 7, 8 and 9, and particular referencewill therefore be made to these figures.

By referring particularly 7 and 10, it will be noted that the actuatingmechanism 1F, together with the motor D, is laced on a base plate 6.Mounted on the base plate is a frame 7 and disposed central 1y of saidframe is a stationary vertical shaft 8. Journalled exteriorly of thestationary shaft is a tubular shaft 9, which is rotated by means of aworm gear 10, this worm gear being driven by the electric motor Dthrough adapted to engage.

as shown at 24, and it a coupling 11 secured on a shaft 12.. This shaftcarries a worm pinion 13 which meshes with a worm gear 14. This gear issecured on a cross-shaft 15 and it in turn carries a worm pinion 16which intermeshes with theuorm gear 10. A reduction drive is 1n thismanner obtained whereby the tubular shaft 9 is rotated at an approximatespeed of one revolution in three minutes.

The motor D serves two main functions, first, that of driving the blowerD, which is direct connected therewith, and secondly that ofcontinuously rotating the tubular shaft 9 through means of the.reduction worm gears just described. The motor circuit may be opened orclosed by a manually actuated switch (not here shown) or through athermostatically controlled switch located at any point desired.

The tubular shaft 9 carries a ratchet gear 17 on its upper end and italso carries a disk 18 which is loosely mounted thereon. A drivingconnection is, however, formed between the ratchetgear and the disk 18through means of a pawl 19. This pawl is pivotally mounted as at 20 onthe underside of the disk and it is adapted to be thrown into and out ofengagement with the ratchet gear as will hereinafter be described. Thepawl is thrown into engagement with the iatchet gear by means of aspring 21 and it is automatically thrown out of engagement with theratchet gear when the disk has completed one revolution by means of alever 22 and a detent wheel 23 with which it The detent wheel is ofinterspaced teeth, is automatically roated the distance of one toothwhen the burner is to be started. This rotation is transmitted to thedetent wheel 23 through means of a fly ball governor generally indicatedat G. This governor-is mounted on the shaft 12 and is rotated at motorspeed. Therefore, when the motor is started, governor G expands and asit is connected with a rocker arm 25, movement is imparted thereto inthe direction. of arrow a. The outer provided with a number to Figs. 1,7'

with the ratchet end of the rocker arm is connected with a sliding bar26 and mounted on the sliding bar isa pawl 27 which is adapted to engagewith the teeth 24 of the detent wheel. Hence, when the governor expandsand movement is imparted to the rocker arm 25 and the sliding bar v26,aw1-27 will engage one of the teeth of the inotion thereto so as toadvance the wheel of a revolution, as there are ten teeth on the detentwheel. This advance moves one tooth of the detent wheel out ofengagement with the arm 22 of pawl 19 and the pawl is thus released andis thrown into engagement gear 17 due to the action of spring 21. Y 7

The tubular shaft 9, together with the ratchet gear; normally rotates inthe direction of arrow 6- (see Fig. 1) and as the pawl 19 engages theratchet gear and forms an interlock between the gear and the disk 18,rotary movement will be transmitted to the disk in the same direction.The disk will rotate one revolution and the pawl 19 will then be thrownout of engagement as lever 22 will again engage with one of the teeth ofthe detent wheel. thus rocking it and throwing it out of engagement withthe ratchet gear. The one revolution of the disk 18 takes place when theburner is started. It first of through an electric ignition device; itsecondly turns on the gas to the burner, whereby the atomizing cup ispreheated; third. it opens the air damper E and almost simultaneouslytherewith opens the oil valve which regulates the flow of oil to theatomizing cup; fourth, it opens the circuit through the electricignition device. and fifth. closes the valve which regulates the flow ofgas to the preheating burner. These several opera tions are accomplishedas follows:

Mounted on one side of the base is a pair of valves of any suitableconstruction which are generally indicated at 30 and 31. The lower valveregulates the flow of gas to the preheating burner and the upper valvecontrols the flow of oil to the atomizing cup. The valve 30 is providedwith a stem 32 and the valve 31 with a stem 33. (See Fig. 9). Stem 32 isconnected through means of a link 34 with a cam lever 35 pivotallymounted on theframe as at 36. The stem 33 of valve 31 is connectedthrough means of a link 37 with a cam-actuated hell crank 39, which isalso pivotally mounted on the frame as at 36. Hence, when a rockingmovement is transmitted to the cam lcvcror the hell crank. movement issimultaneously transmitted to either open or close the connected valves30 and 31. To transmit a rocking movement to the bell crank and the camlever, a pair of pins 39 and 40 is employed. The normal position of thepins 39 and 40 when the disk 18 remains stationary, is

etent wheel and impart a rotaryv all closes an electric circuit shown inFig. 1 and their first actuating po# sition, after disk 18 startsrotation, is shown in Fig. 3.

The ignition device may be of any suitable character; for instance, acoil of wire disposed in front of a ilot burner or any other suitabledevice. Vhen an electric C11- cuit is closed, so that cu'rrentispermitted to flow through the coil, it rapidly heats to a point where itwill ignite the gas discharging from the pilot burner, the pilot burneragain serving the function of igniting the gas when the preheatingburner is thrown into operation. A pilot burner normally burns at alltimes and it might, therefore, be thou ht that the electric ignition isunnecessary, ut practical experience has shown that pilot lights blowout or become otherwise extinguished and it is for this reason thatelectric ignition is resorted tons a matter of protcction, and it alsohappens that certain people object to the use of pilot lights and theelectric ignition is then depended upon to ignite the gas dischargingfrom the preheating burner. In any event the electric ignitionisnecessary and useful and it is in this instance. controlled by anelectric circuit generally indicated at H. (See Figs. 1 and 3.)

The switch is of any suitable construction and the circuit therethroughis opened and closed by means of a switch lever 41. Pin 40 assumes aposition adjacent the switch lever when the disk is stationary and itthere- ,fore immediately engages the switch lever and throws it toclosed osition the moment the disk 18 starts rotation, the closedposition of the switch being shown in Fig. 3. Therefore. if the pilotlight should happen to be out, it can readily be seen that it will beinstantly ignited. Pin 39 assumes a position just forward of the camlever 35 when the disk stands stationary and it engages the cam point 35of lever 35 a moment after the circuit through the electric switch hasbeen closed. The pin 39 swings the cam lever about its pivot 36 andthereby imparts a motion through the link 34 and the rod 32 to -open thegas valve 30. The gas controlled by this valve flows to the preheatingburner and it is there ignited either by the electric ignition device orthe flame of the-pilot burner.

By again referring to Figs. 1 and 3, it will be noted that the cam lever35 is provided with a heel portion 35 which is adapted to be engaged bya latching lever 42. This lever normally assumes the position shown inFig. 3, where it engages a stop pin 44 and being held in engagement withthis pin. by means of a spring 45. Therefore, when the cam lever isrocked to the position shown in Fig. 3, the heel thereof engages thenotch in the latching lever 42 and the gas valve is thus held in openposition while pin 39 continues to rotate with the disk. Pin 40 alsomoves away from the switch arm 41 and the circuit through the switch isthus automatically broken.

Pin 39 serves two functions, first, that of. opening the .gas valve, andsecondly, that. (if

closin the same. Pin 39 is shorter than pin 40 an therefore passes belowthe switch lever 41 and also the bell crank 38. Pin 40 is longer and itserves two functions, that of making and breaking a circuitthrough theelectric switch, and that of opening the oil valve and also the airdamper. By referring to Fig. 5 it will be noted that pin 40 has ad isopened slightly in advance of the oil valve,

the object being to permit the air to enter the burner so that it maystart rotating the atomizing cup a moment prior to the admission of oil.

Pin 40 leaves the cam point 38? during the rotation of the disk andmeans must, therefore, be provided for securing the bell crank in itsrocked position. This is accomplished by rovidlng a heel on the bellcrank as in icated at 38". This heel engages the latching arm 51, whichis also connected with a spring 45, and it is in this manner that thebell crank is locked when the air damper and oil valve have been opened.It may here be stated that it remains in this position until the circuitthrough the motor is broken and the burner is stopped. The pin afterleaving the cam point 38 continues moving with the disk and it finallyreaches its stop position at a point adjacent the switch lever 41, asshown in Fig. 6. At this point the driving connection between the diskand the ratchet gear is broken by engagement of the latch arm 22 withthe detentwheel and the disk will therefore remain stopped until themotor is stopped and again started. .The pin 39 reaches the positionshown in'Fig. 6 when the disk is stopped, but before it. reaches thisposition it engages ice the end of the latch arm 42 and rocks this theburner.

insured, as the atomizing cup has been sufliciently heated to vaporizethe 011 and to project it by centrifugal action. The 011 or asesthus-projected are ignited by the pre; heating burner and as thepreheating burner continues operation a few seconds after the oilisturned on, ignition of the oil is in-' sured.

When the disk 18 has completed one revolution and the driving connectionis broken, it can be seen that several operations have been performed.First, the pilot light has been ignited by the electric ignition;secondly, the valve 30 has been opened so as to supply gas to thereheating burner and this gas is ignited by t e pilot burner; th1rd, theair damper is opened when the atomizmg disk has attained vaporizingtemperature; fourth, the oil is turned on a moment after the atomizerhas reached vaporizing temperature and has started rotation due to theadmission of air, and fifth, the valve 30 is again closed a few secondsafter the oil has been turned on. The motor will continue rotating asthe circuit therethrough has not been affected and, in fact, it mustcontinue rotating as long as the burner is to be operated as its mainfunction is that of driving the blower which delivers the air to rotatethe burner and to supply combustion. The governor G, together with thereduction gearing, the tubular shaft and the ratchet gear 17, will alsocontinue rotating, but disk 18 will remain stationary, as the drivingconnection formed through means of the pawl 19 has been broken and itwill remain stationary until the motor is stopped and again started. Thebell crank 38 has, however, been locked in a position where it retainsthe oil valve and the air damper in an open position and means musttherefore be provided for automatically releasing the same when themotor is brought to a stop, or, in other words, when it is desired toshut off 38 is taken care of by the governor G and is accomplished asfollows:

The overnor G assumes the expanded position s own in Fi 4 as long as themotor is in operation 1111f the rocker arm 25 similarly assumes theposition shown in Fi 4 as long as the governor is expanded. The moment,however, that the motor circuit is broken and shaft 12 comes to a stop,governor G gradually contracts due to the ac tion of its sprin androcker arm '25 is thus gradually rocke in a direction opposite to arrowa until it assumes the full hne position shown in Fig. 2. This movementof the rocker arm returns the slide bar 26 and the pawl 27 to a pointwhere the pawl will engage the next tooth on the detent wheel, when themotor is again started. In other words, merely returmng the pawl toanother actuating position.

This release of the bell crank V The return of the rocker arm 25 alsoaccomplishes another function, to-wit, that of releasin" the latchingarm 51 and this is accomplished by attaching a pusher bar 60 to therocker arm 25. The outer end of this pusher bar is provided with anupwardly projecting pin 61 which engages the latchmg arm 51, thusthrowing it to the position shown in Fig. 1. The latching arm 1s therebyswung away from the heel 38 of the bell crank 38, and it is returned toits normal inoperative position shown in Fig. 1 by means of a pullexerted by a sprin 62. The return rocking movement of the ell crank 38closes the oil valve .and similarly the air damper and the burner isthus shut off, as neither air nor fuel is supplied thereto. The pilotlight would naturally continue burning, but should it be blown out orotherwise-extinguished, it is obvious that it would automaticall ignitewhenever the burner is started, as clbsing of the motor circuit willagain start rotation of the disk 18 and actuation of the switch lever41, etc.

Briefly from the foregoing it can be seen that all functions aremechanically actuated and that solenoids, thermostats and like actuatingmechanism are entirely eliminated. The only thermostat which couldpossibly be used in conjunction with this mechanism would be one toautomatically make or break the motor circuit, but as this is a commonfeature, specific illustration thereof is thought unnecessary,particularly in view of the fact'that the motor circuit may be manuallyopened and closed if desired.

Two valves are required in the present instance, one to supply gas forthe reheating burner and one to su ply oil to'tlie atomizing cup. Theseva ves' are automatically opened and. closed and they are connected witha rigid mechanism which positively insures opening and closing of thesame. The mechanism 1s also provided with one air damper and oneelectric switch. These are also automatically opened and closed by thesame mechanism, so that dependable and reliable operation 1s alwaysavailable.

It should furthermore be noted that a common motor is employed to drivethe burner and the actuating mechanism. This is also an importantfeature, as many other automatic actuating mechanisms require a separatemotor for this purpose, while the present mechanism employs one motor,thereby eliminating complicated wire systems, additional switches, etc.

While certain features of the present in vention are more or lessspecifically illustrated, I wish it understood that various changes inform and proportion may be resorted to within the scope of the appendedclaims. I similarly wish it understood that the materials and finish ofthe several parts employed may be such as the experience and judgment ofthe-manufacturer may dictate or various uses may demand.

Having thus described my invention, what I claim and desire to secure byLetters Patent is- 1. In temperature producing and controllingmechanism, the combination with a liquid fuel burner of an atomizertherewith, a .valve controlling the flow of fuel to the atomizer, anelectric motor whereby the atomizer is operated, an air blower driven bythe motor to deliver air to the atomizer, a damper regulating the flowof air to the atomizer and a mechanical controlling mechanism alsooperated by the motor whereby the air damper is first opened a.predetermined time period after the motor is started and then the oilvalve opened a predetermined period after the opening of the a1r valve,and said mechanical controlling mechanismalso adapted to close both theair damper. and the oil valve when the motor is stopped.

2. In temperature producing and controlling mechanisms, the combinationof a liquid fuel burner, an atomizer therein, an electric ignitiondevice cooperating with the atomizer, a valve controlling the flow offuel to the atomizer, an electric motor whereby the atomizer isactuated, a blower driven by the motor to deliver air to the burner, adamper regulating the flow of air, a mechanical controlling mechanismdriven by the motor, and means actuated by the controlling mechanismwhereby, first an electric circuit is closed through the ignitiondevice; second, the air damper is opened; third, the oil valve isopened; fourth, electric circuit through the ignition device is broken,and said controlling mechanism also adapted to automatically close. theair damper'and the oil valve when the motor stops.

3. In temperature producing and controlling mechanisms, thecombination'with an electric fuel burner of an atomizer therein, a valvecontrolling the flow of fuel to the atomizer, an electric motor wherebythe atomizer is actuated, a blower driven by the motor to deliver air tothe atomizer, a damper regulating the flow of air, an electric ignitingdevice co-operating with the atomizer, a switch controlling the circuittherethrough, a mechanical controlling mechanism driven by the motor,and means actuated by the controlling mechanism whereby, first, theswitch is actuated to close an electric circuit through the ignitiondevice; second, the air dam er is opened; third, the oil valve isopened; ourth, the switch isactuated to break the circuit through theignition device, and said controlling mechanism also adapted toautomatically close the air damper and fuel valve when the motor stops.

4. In a temperature producing and controlling mechanism, a liquid fuelburner, an atomizer in said burner, a valve controlling a flow of'oil tothe atomizer, an electric motor, an air blower driven thereby adapted todeliver air' to the burner, a gas burner adapted to preheat theatomizer, a damper in the blower, a' valve controlling the flow of gasto the preheating burner, an electric ignition device cooperating withsaid preheating gas burner to ignite the same, a mechanical con trollingmechanism driven by the electric motor, and means actuated by thecontrolling mechanism whereby first an electric circuit is closedthrough the ignition device, secondly, the gas valve is opened. third,the air damper is opened, fourth the oil valve isopened, and

fifth the electric circuit through the ignition device is broken, andsixth the gas valve is closed.

5. A mechanical controlling mechanism of thecharacter describedcomprising an electric motor, a shaft driven thereby, a governor on saidshaft, a sleeve shaft driven by the motor and adapted to be continuouslyrotated by the same, a disk loosely mounted on the shaft, means actuatedby the gover- 'nor whereby a driving connection is formed between thesleeve shaft and the disk, and

other means for breaking said driving connection when the disk hascompleted one revolution.

6. A mechanical controlling mechanism of the character describedcomprising 'anelecw tric motor, a shaft driven thereby, a overnor onsaid shaft, a sleeve shaft driven by the motor and adapted to'becontinuously rotated by the same, a disk loosely mounted on the shaft,means actuated by the governor whereby a driving connection is formedbetween the'sleeve shaft and the disk, other means for breaking saiddriving connection, an electric switch, and means actuated by therotation of the disk for opening and closing said switch.

7 A mechanical controlling mechanism of the character describedcomprising an electric motor, a shaft driven thereby, a gov-,

ernor on said shaft, a sleeve shaft driven by the motor and adapted tobe continuously rotated by the same, a disk loosely mounted on theshaft, means actuated by the governor whereby a driving connection isformed between the sleeve shaft and the disk, other means for breakingsaid driving connection, a pair of valves, means actuated by therotation of the disk for opening and closing one valve and for openingthe other valve, and means actuated by the governor for closing saidother valve.

8. A mechanical controlling mechanism of the character describedcomprising an electric motor, a shaft driven thereby, a governor on saidshaft, a sleeve shaft driven by the motor and adapted to be continuouslyon the shaft, means actuated by the governor whereby a drivingconnection is formed between the sleeve shaft and the disk,-ot her meansfor breaking said driving connection, a pair of valves, means actuatedby the rotation ofthe disk for opening and closing one valve and for oening the other valve, means actuated by t e governor for closing saidother valve, an electric switch, and means actuated by the rotation ofthe (1151! for opening and closing said switch.

9. The combination with a liquid fuel burner having an atomizer, apreheatlng gas burner, a blower for delivering air thereto, valvecontrolled ,pipe lines for deliverlng 011 to the atomizer and gas to theburner, of an electric motor adapted to drive the blower and theatomizer, a mechanical controlling mechanism driven by the motor, andmeans actuated by said controlling mechanism whereby, first, a valve isopened to deliver gas to the preheating burner, second, an air damper isopened to permit air to be del1v ered to the burner, third, an oil valveis opened to deliver oil to the atomizer, and fourth, the gas valve isturned off.

10. The combination with a liquid fuel burner having an atomizer, apreheating gas burner, a blower for delivering air thereto, valvecontrolled pipe lines for delivering oil to the atomizer and gas to theburner, of an electric motor adapted to drive the blower and theatomizer, a mechanical controlling mechanism driven by the motor, meansactuated by said controlling mechanism whereby, first, a valve is openedto deliver gas to the preheating burner, secondly, an air damper isopened to permit air to be delivered to the burner, third, an oil valveis opened to deliver oil to the atomizer, and fourth, the gas valve isturned off, a governor driven in unison with the mechanical controllingmechanism, and means actuated by said governor for closing the oil valveand the damper when the motor is stopped.

11. The combination with a liquid fuel burner having an atomizer, apreheating gas burner, a blower for delivering air thereto, valvecontrolled pi e lines for delivering oil to the atomizer an gas to theburner, of an electric motor adapted to drive the blower and theatomizer, a mechanical controlling mechanism driven by the motor, meansactuated by said controlling mechanism whereby, first, a valve is openedto deliver gas to the preheating burner, secondly, an air damper isopened to permit air to be delivered to the burner, third, an oil valveis opened to deliver oil to the atomizer, and fourth, the gas valve isturned off, a governor driven in unison with the mechanical controllingmechanism, means actuated by said governor for closing the oil valve andthe damper when the motor is stopped, and means actuated by themechanical controlelectric motor mounted thereon,

ling mechanism for ignitin 'the gas when delivered to the preheatingurner.

12. In a mechanical controlling mechanism of the character described, aframe, an electric motor mounted thereon, a shaft journalled in theframe and driven by the motor, a governor on said shaft, a reductiongear train driven by said shaft, a second shaft driven at reduced speedby said reduction gearing, a disk loosely mounted on said shaft, meansactuated by the governor whereby a driving connection is formed betweenthe second shaft and the disk, and other means for breaking the drivingconnection when the disk has completed one revolution.

13. In a mechanical controlling mechanism of the character described, aframe, an electric motor mounted thereon,'a shaft journalled in theframe and driven by the motor, a

governor on said shaft, a reduction gear train driven by said shaft, asecond shaft driven at reduced speed by said reduction gearing, a diskloosely mounted on said shaft, means actuated by the governor whereby adriving connection is formed between the second shaft and the disk,other means for break ing the driving connection when the disk hascompleted one revolution, an oil and a gas regulating valve disposedadjacent the frame, an air damper, means actuated by rotation of thedisk whereby the gas valve is opened and closed, means actuated by therotation of the disk whereby the air damper and the oil valve areopened, and means actuated by the'governor whereby the oil valve and airdamper are closed.

14. In a mechanical controlling mechanism of the character described, aframe, an elec tric motor mounted thereon, a shaft journalled in theframe and driven by the motor, a governor on said shaft, a reductiongear train driven by said shaft, a second shaft driven at reduced speedby said reduction gearing, a disk loosely mounted on said shaft, meansactuated by the governor whereby a driving connection is formed betweenthe second shaft and the disk, other means for breaking the drivingconnection when the disk has completed one revolution, an electricswitch, a gas valve, means actuated by the rotation of the disk wherebythe circuit through the switch is opened and closed, and

other means actuated by the rotation of the disk whereby the gas valveis opened and closed.

15. In a mechanical controlling mechanism of the character described, aframe, an

a shaft journalled 111 the frame and driven by the motor, a governor onsaid shaft, a reduction ear train driven by said shaft, a second s aftdriven at reduced speed by said reduction gearing, a disk looselymounted on said shaft, means actuated by the governor whereby a drivingconnection is formed between the second shaft and the disk, other meansfor breaking the driving connection when the disk has completed onerevolution, an electric switch, a gas regulating valve, an 5 oilregulating valve and an air damper, means actuated by the rotation ofthe disk whereby the switch is opened and closed,

means actuated by the rotation of the disk whereby the gas valve isopened and closed,

means actuated by the rotation of the disk 1 v whereby the oil valve andair damper are opened, and means actuated by the governor for closingthe oil valve and air dam r.

\ WALTER L. DREYFUg

